- cookbook 156: a FAILED draft can poison the fleet. gate_stage's arity pre-pass writes
the shared engine_core.h before the gate; a rejected draft's caller-signature edit
survived and broke 141/213 binaries. Byte-gate held (fail-closed). The trap: a broken
tree makes every later gate report 'near' -- two batches of verdicts were void, not
evidence. Standing practice: GATE_NO_ARITY=1, assert 'git status --porcelain
src/shared config' empty after every batch, recover by revert+replay (deterministic).
- cookbook 157: the cheap-tier size cliff, measured over two controlled waves.
Haiku 4-27 ins 86% (~44k tok/match); >=50 ins 20% (~177k, 4x worse). The documented
'<=50' band was optimistic. Agent honesty 63/63 claims true across 100 drafters.
- tools/wave_snapshot.py: immutable sha1-manifested per-wave .s copy, so a running wave
can no longer block R22's 'make clean'. Coverage-asserting (exit 2 on a missing target),
negative-control proven.
- docs/concurrency-design.md (Fable5): the lane contract, the false-bank correctness
argument, and the finding that a worktree verify certifies the COMMIT -- strictly
stronger than our main-tree R22, which also compiles untracked strays.
- checkpoint p7.
Drew T